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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <em>着重文字</em>
    <b>粗体文字</b>
    <i>斜体</i>
    <strong>加重语气</strong>
    <sup>上标</sup>
    <sub>下标</sub>
    <del>删除字</del>
    <span>无特殊意义</span>
</body>
</html>